Bolt-anchor.



J. KENNEDY.'

BOLT ANCHOR. yAPILIOATION FILED' AUG. 24, 1911.

. 1,625,275. A Patented My 7,1912.

gg lvlmulluuw umm WITNESSES:

l *E :i Y Z9' BY 'v 4 l v ATTOHNE COLUMBIA PLANOGRAPII Co.. WASHINGTON.D. c,

UNITED sTATEs 1 PATENT oEEToE.

JOSEPH KENNEDY, OF NEW YORK, N. Y., ASSIGNOR TO THE CLEMENTS C0., .ACORPORATION OF NEW YORK.

BOLT-ANCHOR.

Specification of Letters Patent.

Patented May 7, 1912.

Application led August 24, 1911. Serial No. 645,871.`

To all whom it may concern:

Be it known that I, J osErnV KENNEDY, a`

citizen of the United States of America, and a resident of New York,county and State of New York, have invented certain new and usefulImprovements in Bolt- Anchors, of which the following is aspecification, reference being had to the accompanying drawings, forminga part thereof.

My invent-ion relates to improvements in bolt anchors of the characteremployed for obtaining anchorage in brick or stone walls or the like, ofwhich the material is of a character not adapted to directly receive athreaded bolt.

My invention relates to a longitudinally segmental anchor interiorlythreaded, flexible intermediate its ends, and provided with an expanderadapted to be forced forward to expand a part of the anchor withoutexpanding the screw threaded portion.

My invention further consists in an anchor which may be fastened inposition by expanding, and is adapted to receive bolts of varyinglengths.

I have found by experience in the past that it is often desirable, afterthe bolt anchor has been fastened in place, to be able to remove thebolt and yet leave the anchor firmly fastened in position. This is aparticularly desirable feature in such places as mines, for securinghangers, etc. It is also a very desirable feature to be able to removethe boltwhen it is used for securing appa-` ratus in position on wallsor ceilings, such as electrical apparatus, lamps, and like devices,where it is frequently necessary to loosen the bolt and apparatus 'andlater secure other apparatus which may require a different length bolt,or may not permit the same bolt to be inserted the same distance.

In order that my invention may be thoroughly understood, I will nowproceed to describe an embodiment thereof, having reference to theaccompanying drawings illustrating the same, and will then point out thenovel features in claims.

In the drawings: Figure 1 is a view in central longitudinal sectionthrough a bolt anchor constructed in accordance with my invention, thesection being taken on line 1-1 of Fig. 3. Fig. 2 is a View inlongitudinal section therethrough, the bolt being shown as completelyinserted and the anchor segments expanded by the expanding device. Fig.3 is an end view on the anchor viewed from the threaded end. Fig. 4f isa transverse sectional view upon the line 1 4 of Fig. 1. 'F ig. 5 is aview in longitudinal sect-ion through a bolt anchor in which theexpander is of a dierent form than that shown in Fig. 1. Fig. 6 is anend view of the anchor shown in Fig. 5. Fig. 7 is a perspective view ofthe expander shown in Fig. 5. Fig. 8 is a longitudinal section of ananchor with an expander of slightly different form than that shown inFig. 1. Fig. 9 is an end view of a modification of the anchor shown inFig. 8. Fig. 10 is a central longitudinal section through a bolt anchorconstructed in accordance with my invcntion, without the threads.

Referring first of all to the ancho-r shown in Figs. 1 to 4 inclusive,the same comprises a shell divided longitudinally throughout its length,the two parts being numbered 10-11. The shell has a longitudinal bore,the forward end 15 of which is provided with a screw-thread adapted toreceive a bolt, the remaining portion of the bore being smooth andhaving an expander within. The Walls of the shell are cut away to formopenings the opposite faces of which converge toward the end of theshell, which openings receive a pair of cam-shaped extensionsV locatedon either Vside of the expander. Preferably the lateral extensions ofthe expander fit the convergent surfaces of the cutaway portion of theshell wall so that the slightest movement of the plug to ward the innerend of the shell will cause the parts of the shell to separate orexpand. A transverse groove 16 is provided near the middle of the shellto facilitate this expansion as will more fully hereinafter be shown.

In Fig. 1 the two parts of the shell are shown assembled with the plugexpander in position. f

In operation' the anchor is disposed in a slightly undercut opening 18prepared to receive it, and the bolt is inserted. As the bolt is drivenhome its end engages the expander 12 and forces it ahead toward theinner end of the shell. The two convergent cams 13-13 engage thesurfaces of the openings in the shell 14 and spread the parts of theshell apart as shown. In this form of anchor the shell is preferablymade of a soft metal such as lead, or a lead composition, and thesegments will be bent or swaged to conform to the configuration of thehole, by the plug expander, as will be well understood by those familiarwith this art. The weakening of the shell at 16 by a groove of suitables ape, facilitates this bending or swaging operation, and also permitsthe threaded portion to retain its shape and accurately fit the boltespecially where the material in which the anchor is placed shows anyweakness or tendency to yield.

Many modifications of my bolt anchor may be made without departing fromthe spirit ofv my invention and in Figs. 5, 6, and 7 I have shown one ofsuch modifications in longitudinal section, end view and perspectivedetail view, an anchor longitudinally divided and provided with anexpanding element which has longitudinal extensions or arms and isadapted to be made of sheet metal, by punching, for example. The twosegments of the shell are numbered 24E- 25 and are provided at itsforward end with screw threads 23 adapted to receive the bolt. The screwthreads extend for a part of the length of the bore only, the remainingportion being smooth and cut away to receive the convergent cam surfaces28 which fit and coact with the cam surfaces of the walls of the shellas shown at 20. The two arms 22 are connected by a bridge piece 21 whichis adapted to engage the end of the bolt when it is driven home. In thisform of anchor I preferably make the arms 22 of such length that theyextend beyond the forward end of the shell to assist in the applicationof the device as will be pointed out.

In Figs. 8 and 9 I have illustrated a modiication of the shape of thebore of the shell and of the plug expander for use therewith. I havenumbered the plug 26 in Fig. 8. It is the frustum of a cone in form andt-he cone surface engages the convergent bore of the shell so that uponthe insertion of the bolt the shell will begin to expand immediately,the bolt moving the plug which is in contact with the bore of the shell.

In Fig. 10 I have illustrated an anchor of the same construction asshown in Fig. 1, except that I have omitted the screw threads.

It often happens that it is convenient to first fasten the bushing inplace and have it secured firmly enough to prevent its falling out orbeing jarred out. To accomplish this result the shell with its expanderis first inserted, and if the expander is of plug form, it is driven inby inserting a small rod in the shell and tapping with a hammer. lVherethe sheet metal form is used with the extending arms, no special tool isused to drive them in. lVithout removing the bolt the anchor may befurther expanded and there by tightened by means of the extending arms.In either form the expansion may be continued until the bolt is drivenhome as described.

It will be understood that more than two segments may be employed, inpractical use, and that expanders of other forms may be employed.

What I claim is:

1. A bolt anchor comprising a tubular shell split longitudinally, saidshell being constructed to form a transverse annular groove about thecentral portion thereof, one part of said tube being provided withinterior screw threads from the end of the tube to a point near saidgroove, the other part of the shell being provided with faces convergingtoward the unthreaded end, and an expanding member adapted to engagesaid converging faces.

2. A bolt anchor comprising a tubular shell split longitudinally, saidshell being constructed to form a transverse annular groove about thecentral portion thereof, one part of said tube being provided withinterior screw threads from the end of the tube to a point near saidgroove, the parts of said shell the other side of the groove being cutaway to form openings between them having faces converging toward theunthreaded end, and an expanding member adapted to engage saidconverging faces.

8. A bolt anchor comprising a tubular shell split longitudinally, saidshell being constructed to form a transverse annular groove about thecentral port-ion thereof, one part of said tube being provided withinterior screw threads from the end of the tube to a point near saidgroove, the adjacent parts of said shell the other side of the groovebeing cut away to form openings between them having faces convergingtoward and extending to the unthreaded end, and an expanding memberwithin the unthreaded portion of the shell having opposed projectionsextending into said openings and adapted to engage said convergingfaces.

4. A bolt anchor comprising a tubular shell of soft metal splitlongitudinally, said shell being constructed to form a transverseannular groove about the central portion thereof, one part of said tubebeing provided with interior screw threads from the end of the tube to apoint near said groove, adapted to receive a bolt, the adjacent parts ofsaid shell the other side of the groove being out away to form openingsbetween being in the path of and arranged to be them having facesconverging toward and moved by a bolt inserted in the threaded extendingto the unthreaded end, and an exportion of the shell.

panding member Within the unthreaded por- JOSEPH KENNEDY. 5 tion of theshell having opposed projections Witnesses:

extending into said openings and adapted to E. S. MORRIS,

engage said converging faces, said member I. B. MOORE.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

